But you did that by making a big, surprising claim for which you haven't provided any evidence. You might not intend for that to be the main thing people focus on, but they are right to be both interested and skeptical! If true, it's a big deal.
The closest thing I could find is this (https://www.thenation.com/article/archive/voters-predominant...), which was attributed to 'human error' rather than fraud, and was resolved by allowing the affected voters to cast provisional ballots. 'Human error' is a vague explanation, and for all I know it was a coverup -- but the onus is on you to provide some positive reason to believe that. Surely there were plenty of people motivated to investigate this, so it would be surprising if a bullshit explanation was just quietly accepted and no further public attention paid.